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Cyclisation of l-Phenyl-4-carboxymethylmercapto-5-arylazo-hydantoins A. F. A. Shalaby*, M. A. Abdel Aziz, and S. S. M. Boghdadi Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt Z. Naturforsch. 36b, 501-504 (1981); received November 26, 1980 Arylazo Compounds, Mannich Bases l-Phenyl-4-carboxymethylmercapto-5-arylazo-hydantoin derivatives (3a-f) were cy- clised with acetic anhydride to give the bicyclic products (4a-f). Compounds 4 a, b condensed with aromatic aldehydes in acetic acid and in presence of anhydrous sodium acetate

activation /1,2/. Reduction of carcinogenic azo compounds leads in some cases to loss of carcinogenic activity, while oxidation of azo compounds may promote activation /1,2/. The microsomal processes involved in N-oxidation of azo compounds are thought to be mediated by NADPH-dependent processes, involving either the cytochrome P- 450 system or the flavoprotein amine oxidase /5/. Although the in vitro metabolism of bisalkyl, bisaryl and aralkylazo compounds has been previously reported, studies on the in vitro meta- bolism of heterocyclic arylazo compounds are

(XXV) N0 2 ao -Go HN03 0 2N OH N0 2 (XXVI) 242 RECENT JAPANESE CONTRIBUTIONS IN TROPONOID CHEMISTRY (XXVII) (XXIX) __{'fo X ~OH N==N 'q; (XXVIII) (XX VIlla) (XXX) structure of the 1,2,5-tropoquinonoid form (XXX). Arylazo compounds of 4-ethyl- and 4-acetamidoethyltropolone (XXXI a, b) easily cyclize to afford a heterocyclic compound (XXXII), which exists in the yellow- coloured enolic form (XXXIIa)10• The sodium derivative of 4-acetyltropolone (XXXIc) instantly cyclizes on acidification to give a purple-coloured pigment (XXXIIb) (Figure 3

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Acids with Imines (N) 1047 6 - Ary laminobenzthiazoles Synthesis of 6-N-Aryl and Heteroaryl Benz- thiazoles as Potential Anthelmintics . . . . 108 Arylazo Compounds Cyclisation of l-Phenyl-4-carboxymethyl- mercapto-5-arylazo-hydantoins 501 Arylfluoroarsonium Quantitative Synthesis of (C0H5)2AsF2+AsFe_ and (CeH5)2AsF3 via Interaction of Benzene with Arsenic Pentafluoride 1461 Aryloxi Substitution Synthesis and Properties of Alkoxi and Aryloxi Substituted Trithiadiborolanes 1344 Aspergillus oryzae Isolation and Structure Investigations on the Ribonuclease